chore: audit(2026-05) phase 2a slice 9: extract storage concern

[ooples]

Stacked on #1436. Extracts 6 storage Configure methods (Caching, Versioning, ABTesting, ExperimentTracker, ModelRegistry, DataVersionControl). 8/8 tests pass, both TFMs clean.

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🤖 PR Title Auto-Fixed

Your PR title was automatically updated to follow Conventional Commits format.

Original title:
audit(2026-05) phase 2a slice 9: extract storage concern

New title:
chore: audit(2026-05) phase 2a slice 9: extract storage concern

Detected type: chore: (default type)
Version impact: No release

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